By Guy Taylor Wizz Air’s half-year profit tumbled by over a fifth as long-running problems with some of its engines forced the carrier to ground aircraft. The Hungarian budget airline reported a 21.3 per cent dip in net profit to €315.2m (£262.7m) over the six months to 30 September. Earnings before interest, taxation, depreciation and amortization (EBITDA) also declined by 5.9 per cent to €826m. Passenger numbers stayed broadly level with what amounted to a booming year of travel in 2023, at 33.3m, leading to a 0.5 per cent increase in revenue to €3.1bn. “Wizz Air has delivered a resilient pe…